A sniper is supposedly a sitting duck. Let me give you a little story...
I'm in the Alderaan warzone and I spot a lone Gunslinger. Start to run up to him, almost within charge range and he... Drops portable cover and starts firing at me.
There's little I can do other than run away or get in there at this point, so I start to charge up to him and...
He does a series of 1k, 2k, 1k damage hits, quickly bringing me down to 3/4 health.
Finally get into range and start wailing on him for him to just sit in cover and carry on bashing me about.
I go down when he's at half health.
not the smartest approach. As a Shadow i use stealth or hit them with stun to close my gap.